Mechanism of biochar soil pore-gas-water interaction: gas properties of biochar-amended sandy soil at diferent degrees of compaction using KNN modeling

• Autorzy: Garg Ankit , Huang He , Kushvaha Vinod , Madhushri Priyanka , Kamchoom Viroon , Wani Insha , Koshy Nevin , Zhu Hong-Hu

Identyfikatory

DOI

10.1007/s11600-019-00387-y

• Języki publikacji: EN

Abstrakty

EN

Soil compaction has contrasting efect on soil strength (i.e., positive) and vegetation growth (i.e., negative), respectively. Biochar has been utilized mostly in combination with soils in both agricultural felds (i.e., loose soils) and geo-structures (i.e., dense soil slopes, landfll cover) for improving water retention due to its microporous structure. Biochar is also found to be useful to reduce gas permeability in compacted soil recently. However, the efciency of biochar in reducing gas permeability in loose and dense soils is rarely understood. The objective of this study is to analyze efects of compaction on gas permeability in soil at diferent degrees of compaction (i.e., 65%, 80% and 95%) and also diferent biochar amendment contents (0%, 5% and 10%). Another aim is to identify relative signifcance of parameters (soil suction, water content, biochar content and compaction) in afecting gas permeability. Experiments were conducted before applying k-nearest neighbor (KNN) modeling technique for identifying relative signifcance of parameters. Biochar was synthesized from a coastal invasive species (water hyacinth), which has relatively no infuence on food chain (as unlike in biochar produced from biomass such as rice husk, straw, peanut shell). Based on measurements and KNN modeling, it was found that gas permeability of biochar-amended soil is relatively lower than that of soil without amendment. It was found from KNN model that for denser soils, higher amount of soil suction is mobilized for a signifcant increase in gas permeability as compared to loose soils. Among all parameters, soil suction is found to be most infuential in afecting gas permeability followed by water content and compaction.

Słowa kluczowe

EN

KNN modeling; biochar-amended soil; coastal species; compaction; suction

PL

modelowanie KNN; gleba zmieniona biowęglem; gatunki przybrzeżne; zagęszczenie; ssanie

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2020
• Tom: Vol. 68, no. 1
• Strony: 207--217
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Garg Ankit

• Department of Civil and Environmental Engineering, Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou University, Shantou, China

autor

Huang He

• Department of Civil and Environmental Engineering, Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou University, Shantou, China

autor

Kushvaha Vinod

• Department of Civil Engineering, IIT Jammu, Jammu, India

autor

Madhushri Priyanka

• Staley Black and Decker, Atlanta, GA, USA

autor

Kamchoom Viroon

• Department of Civil Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand

autor

Wani Insha

• Department of Civil Engineering, IIT Jammu, Jammu, India

autor

Koshy Nevin

• Department of Civil Engineering, IIT Jammu, Jammu, India

autor

Zhu Hong-Hu

• School of Earth Sciences and Engineering, Nanjing University, Nanjing, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)